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发明公开
CN110456129A 一种电位差检测电路、检测方法及POE系统 无效 - 撤回

一种电位差检测电路、检测方法及POE系统
摘要：
本发明实施例提供一种电位差检测电路、检测方法及POE系统。所述电路应用于POE系统中，包括：PSE控制器、PSE防雷电路、开关电路和隔离电路；PSE防雷电路的输入端与开关电路连接，开关电路与PSE控制器连接；PSE防雷电路的输出端中的第一端与隔离电路的输入端中的第一端连接，PSE防雷电路的输出端中的第二端与隔离电路的输入端中的第二端连接；隔离电路的输出端中的第一端与PSE控制器连接，隔离电路的输出端中的第二端接地；PSE控制器用于在预设时段内控制输出第一电压，并根据隔离电路的输出端中的第一端反馈的第二电压，判断述POE系统中的供电设备PSE的电位差是否存在异常，解决了POE系统在使用过程中因不共地而导致供电设备或受电设备烧毁的问题。
摘要（英）：

Embodiments of the invention provide a potential difference detection circuit and method and a POE system. The circuit is applied to the POE system and comprises a PSE controller, a PSE lightning protection circuit, a switch circuit and an isolation circuit; the input end of the PSE lightning protection circuit is connected with the switch circuit; the switch circuit is connected with the PSE controller; the first end of the output end of the PSE lightning protection circuit is connected with the first end of the input end of the isolation circuit; the second end of the output end of the PSE lightning protection circuit is connected with the second end of the input end of the isolation circuit; the first end of the output end of the isolation circuit is connected with the PSE controller; the second end of the output end of the isolation circuit is grounded; and the PSE controller is used for controlling output of a first voltage in a preset time period and judging whether a potential difference of PSE in the POE system is abnormal or not according to a second voltage fed back by the first end of the output end of the isolation circuit. The problem that the PSE or power receiving equipment is burnt out due to no common ground for the POE system in use is solved.

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